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| [![](https://www.tensorflow.org/images/GitHub-Mark-32px.png) View source on GitHub](https://github.com/tensorflow/tensorflow/blob/v2.21.0/tensorflow/python/ops/special_math_ops.py#L132-L159) |

Computes the Exponential integral of `x` element-wise.

    tf.math.special.expint(
        x, name=None
    )

The Exponential integral is defined as the integral of `exp(t) / t` from
`-inf` to `x`, with the domain of definition all positive real numbers.

    tf.math.special.expint([1., 1.1, 2.1, 4.1]).numpy()
    array([ 1.8951179,  2.1673784,  5.3332353, 21.048464], dtype=float32)

This implementation is based off of the Cephes math library.

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| ## Args ||
|---|---|
| `x` | A `Tensor` or `SparseTensor`. Must be one of the following types: `float32`, `float64`. |
| `name` | A name for the operation (optional). |

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| ## Returns ||
|---|---|
| A `Tensor` or `SparseTensor`, respectively. Has the same type as `x`. ||

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## scipy compatibility

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Equivalent to scipy.special.expi

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